Rock-drill.



Arron/75w No. 735,717. PATENTE-D AUG. 11-, 1903.

H. A. DALMAS.

ROCK DRILL.

- APPLICATION FILED AUG. 23, 1902.

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' PATENTED'AUG. 11,-1903.

H. A. DALMAS.

ROCK DRILL. APPLICATION FILED AUG. 23, 1902.

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- Patented August 11, 1903.

PATENT ()FFICE.

HENRY A. DALMAS, OF LINDEN, VIRGINIA.

ROC K-DRILL.

SPECIFICATION forming part of Letters Patent No. 735,717, dated August 11, 1903.

Application filed August 23, 1902.

To all whmn it may concern.-

Be it known that I, HENRY A. DALMAS, a citizen of the United States, residing at Linden, in the county of Warren and Stateof Virginia, have invented certain new and useful Improvements in Rock-Drills, of which the following is a specification, reference being had therein to the accompanying drawings.

My invention relates to rock-drills, and more particularly to the means for coupling the piston thereof to the reciprocating crosshead or other means for actuating same.

The object of the invention is to provide a rock-drill wherein the coupling between the piston and the reciprocating cross-head or other actuating means will be strong, du-

rable, and efficient and be composed of few elements, wherein the key to said coupling will be capable of ready adjustment and release to facilitate assembling or repairs and be so constructed and arranged as to avoid a multiplicity of small'parts or the exposure to any or great strains of parts liable to breakage thereunder with resulting injury to other working parts, and wherein said key will not be subject to disarrangement through vibration of the drill while at work.

The invention consists in the novel features of, construction hereinafter set forth and deare respectively a plan view and a side elevation of the upper portion of the piston. Figs. 5 and 6 are respectively a plan view and a side elevation, partly in section, of the piston-collar. Fig. 7 is a side elevation of the key, partly broken away. Fig. 8 is a top plan view thereof, and Fig. 9 is a bottom plan thereof.

Like letters refer to like parts throughout the several views.

As theinvention relates more particularly in and about the means for coupling the piston to the reciprocating cross-head, a detailed description of the actuating mechanism and the feeding mechanism will not be entered into. These may consist of any well-known or desired construction, the accompanying drawings showing a well-known type of rockdrili, in which A denotes the geared connection with a source of power, B, the fly'- wheel; 0, the eccentric by means of which the cross-head frame I) is reciprocated, and E'the' mechanism for imparting a rotary movement to the drill, which is held by the chuck F. The drill-casing G is fed forward by means of an ordinary screw-feed mechanism, as H. The

chuck F is carried by a piston a, the end of which opposite thereto is provided with an elongated longitudinal slot, as a. This piston passes through a central opening in the cross-head b, which is carried by and movable with the frame D. The rear portion of this piston is enlarged to form'an annular spring-seat 0. thereon. A removable collar 0, secured to said piston in a manner to be more fully described hereinafter, constitutes a second spring-seat parallel therewith on the opposite side of said cross-head. To relieve thejentire working mechanism of the drill from excessive jars and vibration and to permit of an irregular penetration of the drill at piston-strokes of' uniform length, helical springs, as d d, are seated between opposite sides of said cross-head b and the spring-seats a and collar 0, respectively, and

said piston is therefore reciprocated solely through the agency of these springs. To facilitate assembling, repairs, &c., it is essential that these springs and the entire piston should be capable of being quickly and readily secured in position or removed, and, as in all types of rock-drills, owing to the severe service and their field of work, it is also essential that as few and as strong parts as possible be employed to increase the durability of the machine and keep it in commission without repairs aslong-as possible':-I t is particularly desirable to avoid the use of small parts, which through jars or breakages may become detached and by' entering the coils of the springs or the eccentric driving mech anism cause serious damage to parts of the machine which cannot be replaced readily or quickly. In most forms of couplings now in generaluse several such parts are found, and to avoid such a construction I use a key a to secure the collar 0 to the piston a and complete the coupling of this piston to the cross-head 1). Referring now to Figs. 7, 8, and 9, it will be seen that this key 6 comprises a shank 0', adapted to enter the slot at and be flush with the periphery of the piston and oppositely-disposed shoulders e 6 extending beyond said piston and adapted to engage saidcollar 0 and prevent its sliding from said piston. In one side of the shank e I form a socket, as f, having aguideslot f in the lower portion thereof, and seated in this socket is a plunger provided with a spur 9, moving in the slotf to control and limit the movement thereof. This plunger is normally forced outward by the spring g seated in said socket. On the opposite side of the shank e, adjacent to the end thereof, is an integral lug i. To facilitate the placing of the key e in position, it is provided with a flange, as j, on one of the shoulders e which serves to prevent said key from passing within or through the slot 0.. The collar c in order to cooperate with said key is provided on the inner face thereof with an inclined way 0 and with a hole drilled therein, as 0 of a size to accommodate the plunger 9. This hole is adjacent to and at one side of said way 0 and preferably extends entirely through the collar. On the opposite side of said collar and in a position to aline with the log 2' when the plunger 9 is inserted in the way 0'' is a bayonet-slot 0 In assembling the coupling between the piston and the cross-head the springs d d are placed on each side of the cross-head b and washers it It, which are interposed between said cross-head and said springs, respectively. The piston is then passed through said springs andsaid washers and said cross-head. The collar 0 is then slipped over the piston and brought below the slot a therein and the key e slipped in said slot, the fiangej preventing its passage within or through it. To secure the collar in position, it is merely necessary to turn it until the inclined way 0 thereon alines with the plunger g, which position also brings the lug t' into alinement with the bayonet-slot 0 The springs (l (1 force the collar into engagement with the shoulders c e, the inclined way a forcing the plunger 9 within its socket against the tension of the spring 9 By turning the collar to the right the said plunger is brought under the influence of its spring, so as to enter the hole 0 and prevent further rotation, and the lug i enters the other extension of the bayonet-slot. The spur g limits the action of the spring 9 and prevents the plunger 9 from escaping through said collar from its socket. Hence said key is held against movement in any direction and is not atfected by vibrations or jars. None of the parts except the key 6, which is of sufficient strength to withstand such, are

exposed to any direct or great strains or pressures, and the plunger 9, the only small part used, cannot become broken or detached therefrom in a manner which will permit it to escape and injure other parts of the machine. When repairs are necessary, to release the coupling it is merely required to force the plunger within its socket and out of engagement with the hole in the collar by means of a peg or punch (see Fig. 6) or of the spur g and reverse the steps above described. The coupling or uncoupling with the above-described apparatus can be accomplished in a very few minutes, a resultwhich is very desirable in this art.

The power derived through the gears A and fly-wheel B serves, by means of the eccentric C, to rapidly reciprocate the cross-head frame D and cross-head b. Upon the direct throw of this cross-head the drill carried by the chuck F is plunged forward through the agency of the spring (I acting against the spring-seat 0 The mechanism E upon this movement imparts a rotary movement to the drill and, by means ofa ratchet or other wellknown device, permits a direct withdrawal thereof. The force of the impact with the rock is consumed to a great extent by the spring (1, which whatever the extent of the penetration of the drill at each stroke permits the cross-head to make a full stroke. As in most well-known forms of drills, the entire drill-casing is fed forward by the screw-feed mechanism H.

It is not my intention to limit the invention to the precise construction herein shown and described, asit is apparent that the details of construction maybe varied indefinitely to conform to different types and designs of drills without departing from the spirit and scopeof my invention.

Having described the invention, what I claim as new, and desire to have protected by Letters Patent, is-

1. In a rock-drill,a reciprocating cross-head, 4

a piston provided with an opening therein, a collar encircling said piston, a spring seated between said collar and said cross-head and a key adapted to enter said opening comprising a shank and oppositely-disposed shoulders adapted to engage said collar and a plunger adapted to engage said collarand said key whereby said collar is removably locked on said piston.

2. In a rock-drill,a reciprocating cross-head, a piston provided with an opening therein, a collar encircling said piston, a spring seated between said collar and said cross-head and a key adapted to enter said opening comprising a shank and oppositely-disposed shoulders adapted to engage said collar and a plunger carried by said key and adapted to engage said collar whereby said collar is removably locked on said shaft.

3. In a rock-drill,a reciprocating cross-head, a piston provided with an opening therein, a collar encircling said piston having an opening therein, a spring seated between said 001- lar and said cross-head and a key adapted to enter said first-mentioned opening comprising a shank and oppositely-disposed shoulders adapted to engage said collar, said shank having a socket therein, a plunger seated in said socket and means whereby said plunger may be caused to engage or release said collar by means of said opening therein.

4. In a rock-d rill,a reciprocating cross-head, a piston provided with an opening therein, a collar encircling said piston having an open ing therein, a spring seated between said collar and said cross-head and a key adapted to enter said first-mentioned opening, comprising a shank and oppositely-disposed shoulders adapted to engage said collar, said shank having a socket therein, a plunger seated in said socket, a spring acting on said plunger whereby said plunger may be caused to engage or release said collar by means of said opening therein and means whereby said plunger is retained within said socket.

5. In arock-drill,a reciprocating cross-head, a piston provided with an opening therein, a collar encircling said piston having an inclined way and a bayonet-slot on the inner face thereof and an opening adjacent to said way, a spring seated between said cross-head and said collar, and a key adapted to enter said first mentioned opening' comprising a shank and oppositely-disposed shoulders adapted to engage said collar, said shank having a socket therein, a plunger seated in said socket, a spring acting on said plunger and a lug on said shank, said plunger and said lug respectively being adapted to enter said inclined way and opening adjacent thereto, and said bayonet-slot.

6. Inarock-drill,areciprocatingcross-head, a piston provided with an opening therein, a collar encircling said piston having an inclined way and a bayonet-slot on the inner face thereof and an opening extending therethrough adjacent to said way, a spring seated between said cross-head and said collar, and a key adapted to enter said first-mentioned opening comprising a shank and oppositely.- disposed shoulders adapted to engage said collar, said shank having a socket therein, a plunger seated in said socket, a spring acting on said plunger, a lug on said shank, said plunger and said lug respectively being adapted to enter said inclined way and opening adjacent thereto, and said bayonet-slot, and means whereby the engagement of said plunger with its opening is limited.

7. In aroek-drill,a reciprocating cross-head, a piston provided with an opening therein, a collar encircling said piston having an inclined way and a bayonet-slot on the inner face thereof and an opening adjacent to said way, a spring seated between said cross-head and said collar, and a key adapted to enter said first-mentioned opening comprising a shank and oppositely disposed shoulders thereon adapted to engage said collar, said shank having a socket therein, a flange on one of said shoulders to prevent said key from passing entirely within or through said opening, a plunger seated in said socket, a spring acting'on said plunger, a lug on said shank, said plunger and said lug respectively being adapted to enter said inclined way and open ing adjacent thereto and said bayonet-slot, and means whereby the engagement of said plunger with its opening is limited.

In witness whereof I have hereunto affixed my signature, this 18th day of August, 1902, in the presence of two witnesses.

HENRY A. DALMAS. Witnesses:

F. W. BARKER, GERRIT SMITH. 

